Hello Delaware neighbor,
I am sure you have enjoyed the Delaware State parks which are very nice in my book. There are some great reasonable private CG's up and down the east coast. Many south of Delmarva stay open year round at very affordable rates.
If you plan on some late fall and winter camping other than Killens and Lums pond, which are open year round, there is Cherrystone, Virginia Beach KOA and Holiday travel park, Camp Hatteras and Hatteras KOA on the OBX and many great choices around Myrtle Beach. Enjoy your retirement.